x+y=20(x-10)²+(y-10)²=8 求x-y
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
x²+4y²-2x+12y+10=0求X,Y值
已知x²+4x+y²+6y+13=0,求x-y+(2y²/x+y) 请在10;20分前回答
如果2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y的值
如果2X-Y=10,求代数式[(X²+Y²)-(X-Y)²+2Y(X-Y)]÷4Y
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知2x-y=10,求代数式[x²+y²-(x-y)²+2y(x-y)]÷4y的值
已知/x/+x+y=10,/y/+x-y=12.求x+y的值
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²-y²=10,求[(x+y)³-2y(x+y)²-4(x+y)]÷(x+